That sample doesn't change the x and y position of the image render extension. What is happening is the image is being rotated around a point in the center of the control. The exact x and y position for where that image is rendered isn't available, this is calculated during the rendering of the image render extension. Is there a particular reason you need these coordinates?

How the front end App and back end App is communicating?How the storyboard I/O is registering for the external events?How actually storyboard I/O is working with the frontend and backend(external cpp file)?How the event mapping was happening at both the front end and back end?

For information about how events are communicated through Storyboard and external applications. Designer allows you to create events dynamically. For more information on how events are registered and setup, please see this document: